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Standard cell and standard-cell-type integrated circuit

  • US 5,173,864 A
  • Filed: 06/26/1991
  • Issued: 12/22/1992
  • Est. Priority Date: 08/20/1988
  • Status: Expired due to Fees
First Claim
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1. A process for manufacturing a standard-cell-type circuit, said standard-cell-type circuit including a plurality of standard cells, comprising the steps of:

  • (a) determining a location for a first standard cell in said standard-cell-type circuit, said first standard cell performing a predetermined function;

    (b) evaluating the timing of said standard-cell-type circuit;

    (c) adjusting the timing of said standard-cell-type circuit by replacing said first standard cell with a second standard cell such that the geometry of said standard-cell-type circuit is not changed, said second standard cell performing the same predetermined function as the function performed by said first standard cell, said second standard cell having a time delay different from any time delay of said first standard cell, and said second standard cell including an input terminal to input a scan signal for a functional test of said second standard cell and circuitry to delay said scan signal by a predetermined time period; and

    (d) manufacturing said standard-cell-type circuit, said manufactured standard-cell-type circuit including said second standard cell.

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